Vulcanized caoutchouc-like substance.



UNITED STATES PATENT OFFICE.

FRITZ HOFMANN END CARL COUTELLE, 0F ELBERFELD, GERMANY, ASSIGNORS TOFARBENFABRIKEN VORM. FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A

CORPORATION OF GERMANY.

VUICANIZED CAOUTCHOUC-LIKE SUBSTANCE.

No Drawing.

To all whom it may concern:

Be it known that we, Fnrrz HOFMANN and CARL COUTELLE, doctors ofphilosophy, chemists, citizens of the German Empire. rc-siding atElberfeld, Germany, have invented new and useful Improvements inVulcanized Caoutchouc-Like Substances, of which the following is aspecification.

By our application Ser. No. 594557 the production of a new caoutchouclike substance is described, which is obtained by polymerizingalpha-methylerythrene. 7 It has now been found that this caoutchouc likesubstance can be vulcanized, substances being obtained equal to and someeven better than vulcanized natural caoutchouc. These facts could not beforeseen in the existent state of knowledge with regard to the natureand the processes during the vulcanizing of caoutchouc. One could notknow if this new caoutchoue-like substance too would show the samebehavior to vulcanizing agents as the natural caoutchouc does. Stillless couldone predict, whether the vulcanized product, if it could beobtained at all, would havethe same valuable properties of vulcanizedcaoutchouc.

. In order to illustrate our'invention the following examples are given,the parts being by weight:.

Example 1: 5"parts of the caoutchouo like substance obtained by thepolymerization of alpha-methylerythrene are dissolved in 100 parts ofbenzene. A solution of one part, of sulfur monochlorid (S 01 inpartsofcarbon disulfid (CS is added and the mixture is allowed to standfor 1.5 to 2 minutes, and is then poured into alcohol. On stirring asubstance separates which is distinguished from the parent material bybeing of greater toughness and of better resistance to different agents.It is grayish inv cor and not. adhesive.

x-ample 2: 50 parts of the' caoutchouc like substance obtained bypolymerization of alpha-methylerythrene are intlmately mixed by means ofmixing rolls. with 15 parts of powdered sulfur. The roduct shaped fromthe resulting sheet is t 'en heated in .a suitable apparatus for from 5to 6 hours at 150- 160 C.

- Example 3: 100 parts ofthe product of Specification of Letters Patent.

Application filed March 20, 1911.

polymerization obtained from alpha-methyl- Patented Jan. 13, 1914.

Serial No. 615,669.

erythrene are carefully worked together with 10 parts of sublimed sulfurin a mixing apparatus provided with rolls until a perfectly homogeneousmass results. The resulting product is brought into the desired shapeand is then subjected in an iron vulcanizing vessel to the action ofsteam under a pressure of 3-4 atmospheres. After from 12 hours theprocess is complete.

Instead of the product of polymerization used in the examples a mixtureof the caoutchouc like product obtained from alpham'ethylerythrene withnatural caoutchouc can be used; other methods of vulcanization can alsobe employed.

The novel caoutehouc substance of the present invention forms an ozonidwhich upon decomposition with water yields-the 2- I Vulcanized mixturesof alpha-methylerythrene caoutchouc and of natural caoutchouc formozonids which yield upon decomposition with water both levulinicaldehyde and the isomer referred to above.

1. As a new product a vulcanized caoutchouc-like substance comprisingvulcanized alpha-rhethylbutadiene caoutchouc being a grayishnon-adhesive substance containing sulfur and forming an ozonid whichupon decomposition; with water yields the, 2- .methyl derivatives ofsuccinic aldehyde.

2. As a new product a vulcanized caoutchouc-like substancecomprising avulcanized mixture of natural caoutchouc and alpha-methylbutadienecaoutchouc being a grayish non-adhesive substance containing sulfur andforming an ozonid which upon decomposition with water yields bothlevulinic aldehyde and the isomeric Q-methyl derivative of succinicaldehyde. v

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

Witnesses:

CHAs. J. WRIGHT, ALFRED HENKEL.

